Reverse motion



C. E. umeows.

REVERSE MOTION. APPLICATION FILED OCT.. 8, 1920.

Patented June 27, 1922.

I D vENTo-R B v y 770km;

cHARLEs E. EURRows, 0E vEsTAE, NEW YORK.

REVERSE MOTION.

To all whom t may concern.'

Be it known that I, CHARLES E. Bunnows, of Vestal, in the county of Broome, in the State of New York, have invented new and usefulY Improvements in Reverse Motions, of

which the following,7talren in connection with; the accompanyingdrawings, is a full, clear, and `exact description.

This invention relates to a reverse motion adapted to be used in various appliances for converting rotary into reciprocatory motion, and involves a right hand screw and a left hand screw secured coaxially end to end and driven from any available source of power, in combination with a lever centrally pivoted upon a sliding support and having its opposite ends provided with segmental nuts, together with means for automatically effecting the rocking movement of the-lever in reverse directions tomalternately engage the nuts. with their respective screws for reciprocating the sliding support lengthwise of the screws, so that the reciprocatory movement may be utilized in the operation of pumps, ratchets and other appliances ree uirinOP reci rocator motion.

The Vmain object ,is-to increasethe general working eiiiciency fof, devices of thischaracter, and, at the same time, to reduce the number of parts tov arminimum and to arrange those parts in ,compact` relation,

v in a relatively small spaeeand more nearly in direct connection with the parts operated. Y f n Another object is' to enable certain parts of the device to be adjusted for varyinggthe distance of travel of. the reciproeatory elements. f'

to be Other `objectsand uses relating` to specific parts'of the device ywill be brought out inrk ASpecification of Letters Patent. Y Pgrtgnfed Jun@ 27, 1922 Application filed October 8, 1920. Serial No. 415,534.

Figures 3 and 4f are transverse sectional views taken, respectively, in 4the plane of lines 3-3 and 4 4, Fig. l.

As illustrated, this device comprises a substantially rectangular. main supporting frame -1- having lengthwise parallel side rails -2- and end walls -3- connecting the same, said end walls being provided with bearings A- ,for receiving the opposite ends ofa rotary shaft --5 having a right x hand thread -6- and a left hand threadY through and beyond one of the end walls of the frame f-l; and is'provided with a pulley -7' adapted to be connectedb'y a belt to any available source of power, notshown,

for rotating the shaft continuously.

The sidek rails -2-.- are each provided with apair of lengthwise ribs -S-f projecting inwardly from their inner faces in the -same horizontal plane, preferably above the screw shaftV 5--, the outer ends of each pair beingspacedjapart from the adJacent end walls -3- to form intervening 'pas-` sages9-, while 'the inner ends `of each pair-are alsospacedapart to form an intervening -passage--10-, said passages vserving to permit thepins of the reversing lever, presently described, to pass therethrough frorna position `below toa positionqabove the ribs 8+M, andfvice-versa,as will be hereinafter more .fullyr explained.`

Each kguide rib -8- .is constructed in such manner that its effective length may be varied at. will, and, for this purpose, it is made of lengthwise sections or strips ll-- of substantially thesame formand size but reversed end for end with their major por-y tions. overlapping and slidable lengthwise of and upon each other, one end Iof one section and the opposite end ofthe other section be'- ing .provided with a lateral offset' vhead 12,-- having aboss d3-Q projecting into a lengthwise slot -llin the adjacent rail 2f of the frame for lengthwise adjustment therein.r f y 1 The end of each section l1-f opposite thev offset ,--12- is alsoprovided with ,a lug 15- movable in a lengthwise slot 16 in the companion section -ll-`- for holding said sections in parallelism and permitting their relative lengthwise adjustment along the adjacent supporting rail Q for varying the effective length of the guide rib, and thereby varying the amountof movement of the reciprocatory member presently described. The heads 12 of the rib sections ll are provided with threadedy `the shaft and cross-head without friction one with the other.

A lever 2% extends lengthwise of and directly over the screw shaft 5 and is centrally pivoted at 23 to the upper portion of the cross-head 20 for vertical rocking movement, each end of said lever being provided with a segmental nut 2t both of which are movable alternately into and out of engagement with their respective screws 6 and 6 as the cross-head 20 with the lever thereon is shifted lon-v gitudinally by the engagement of either nut with its corresponding screw.

Suitable pins 25 are secured to the opposite ends of the lever 22 just above their respective nuts 24- and preferably equal distances from` the pivot 23 for engagement with the lower and upper faces of the ribs 8 as the head 20 with the lever 22 thereon is shifted longitudinally in reverse directions, Aand serve to hold one of the nuts in engagement with its corresponding screw and to similarly hold the other nut out of engage-ment with the other screw.

A plunger 26 is movable vertically 'in a hub 27' V on the upper portion of the frame 1 directly over the adjacent ends of the screws 6 and 6 and also directly over the lever 22 and is yieldingly held against the upper edge of said lever by means of a coil spring 28 within the hub 27 and having one end bearing against the plu-nger and the other end against the upper wall of the hub, as shown rmore clearly in Figs. l and 3, the lower end of said plunger being provided with a contact roller adapted to ride along and upon the upper edge of the lever 22 to reduce friction.

The `combined length of the screws 6 and 6 between the end walls 3 is somewhat `greater than the length of the lever 22 and combined lengths of the guide ribs 8 which are adjusted to allow the pin 25 to release their engagement with the ends of their corresponding ribs 8 under the action of the plunger 26 before either nut M reaches the outer end of its corresponding screw when the ribs S are adjusted for a maximum amount of reciprocatory movement of the cross-head 20 On the other hand, the sections 1l of the guide ribs S may be adjusted to shorten the effective lengths of their respective ribs 8 when it is desired to reduce the amount of reciprocatory movement of` last named nut inte engagement with its cor-k responding screw, and to release the other nut from engagement with the adjacent screw.

29 @ratio n.

`Assuming that the screw shaft is being rotated and, that the left hand nut, Fig, l, is in engagement with the screw 6 in which position the opposite nut would be disengaged from the corresponding screw 6 then, as the lever 22 and its supporting cross-head is shifted to the left, the left hand pink will ride against the underside of the adjacent rib -8 while the opposite pin will ride upon the upper face of the right hand rib, during which time, the plunger Q@ will exert downward pressure upon the right hand end of the lever 22 so that as soon as the left hand pin 25- reaches theouter end of the left hand rib 8 the right hand pin 25 will have reached the inner end of the right hand rib 8 thus permitting the pressure exerted upon the right hand end of the lever 22 to rock said end downwardly, thereby forcingthe right hand nut M into engagement with the corresponding screw, while the left hand nut will be moved out of engagement with the adjacent screw.

Under these conditions, the direction of movement of the lever 22 and itsy sup porting cross-head 20 will be reversed with the left hand pin` 25 riding upon the upper face of the adjacent rib S and the right hand pin against the lower face of the right hand rib until the right hand pin 25 reaches the outer end of its corresponding rib 8 and the left handpin reaches the inner end of the adjacent rib,

whereupon, the lever -22- will be restored to its starting position ready ior a return movlement, lthis operation be-ing repeated automatically as long as the shaft -5- continues to rotate.

What I claim is:

l. The combination of a rotary screw, a nut movable into and out vof engagement with the screw and actuated lengthwise thereof when engaged therewith, and means including a guide extending lengthwise of the screw for holding the nut in engagement with the screw during a predetermined movement of said nut along the'screw and for releasing it from said engagement at the end of said movement.

2. The combination of a rotary screw, a nut movable into and out of engagement with the screw, and means for holding the nut in engagement with the screw during a predetermined movement thereof along the screw and for releasing it at the end of said movement, said means including a guide extending lengthwise of the screw and a nut-supporting lever in sliding engagement with the guide.

3. The combination of a rotary screw, a nut movable into and out of engagement with the screw, and means for holding the nut in engagement with the screw during a pre-determined movementV thereof along the screw, and for releasing it at the end of 4. The combination of a rotating screw, a'

reciprocatory member, a lever pivotally mounted on said member, a nut mounted on the lever and movable into and out of engagement with the screw as the lever is rocked in reverse directions, means for holding the lever rocked in one direction to engage the nut with the screw during a predetermined movement of the nut and lever by said screw and for releasing the nut and lever at the end of said movement, said means including a guide adjustable to Vary l its effective length and to thereby vary lthe distance of travel of the lever and its supporting member along the screw, means for operating the released lever at the end of said movement to disengage the nut from the screw, and means for returning the released lever and its support in a direction opposite to that produced by the engagement of the nut with the screw.

In witness whereof I have hereunto set my hand this 25 day of September, 1920.

CHARLES E. BURROWS. Witnesses:

EARL HAWKIVNS, HOWARD MURDooK. 

